DE102016116010C5 - Double belt press and method for continuously pressing a wood-based mat to form a wood-based panel or a laminate - Google Patents

Abstract

Double belt press (1) for continuously pressing a wood-based material mat (2) to form a wood-based material board (3) or a laminate with two press belts (6, 7) which form a press gap (5) between each other and which circulate endlessly around at least two deflection means, the press belts (6, 7) each have an outside that comes into contact with the wood-based mat (2) or the laminate and an inside that does not come into contact with the wood-based mat (2) or the laminate, characterized in that the double belt press (1) for continuous pressing and heating Wood material mat (2) for forming the wood material board (3) or the laminate is designed so that at least one polishing device (17) which removes at least part of the pressing residues (16) from the outside of at least one press belt (6, 7) outside the press gap (5) it is provided that the polishing device (17) is provided for polishing the outside of the press belt (6, 7), that the at least one polishing device (17) has rotating polishing means (24), that at least one motor drive (20) for driving a polishing means ( 24) the polishing device (17) is displaceable transversely to the press belt (6,7), that the at least one polishing device (17) is displaceable transversely to the press belt (6,7), that at least one motor drive (19) for moving the polishing device (17) is provided in a stationary manner transversely to the press belt (6,7), that a guide rail (18) for moving a polishing device (17) is provided transversely to a press belt (6,7), that the at least one motor drive (19) for moving the polishing device (17) transversely to the press belt (6,7) cooperates with the guide rail (18) so that the one polishing agent (24) of the polishing device is at least partially in one together with the polishing agent transversely to the press belt (6,7) displaceably provided suction hood (22) is arranged and that the suction hood (22) is provided with a suction nozzle (23) for suctioning the abrasion from the suction hood (22).

Description

The invention relates to a double belt press for continuously pressing a wood-based material mat to form a wood-based material board and/or a laminate with two press belts which form a press gap between each other and which revolve endlessly around at least two deflection means, the press belts each having an outside that comes into contact with the wood-based material mat and/or the laminate and have an inside that does not come into contact with the wood material mat and/or the laminate. The invention further relates to a method for continuously pressing a wood-based mat to form a wood-based panel and/or a laminate, preferably with a double belt press of the type mentioned.

Wood-based panels that are formed by pressing under the influence of heat are, in particular, chipboard, fiberboard, such as medium-density fiberboard (MDF boards) or high-density fiberboard (HDF boards), and OSB boards (Oriented Strand Board). While chipboard uses glued wood chips, fiberboard uses glued fibers. Beforehand, however, the corresponding wood material particles are scattered on a conveyor belt to form a so-called wood material mat. In this context one also speaks of a cake. The wood material mat can be pre-pressed and is ultimately fed to a double belt press. Alternatively, laminates can also be formed by pressing. If necessary, the laminates have a carrier layer and at least one outer layer, the layers being connected to one another by pressing. Particularly suitable laminates are those in which the carrier layer is formed by a wood-based panel. The at least one outer layer can preferably be designed as a wear layer and/or decorative layer. Such laminates can be so-called CPL laminates (Continuous Pressure Laminates). In the case of floor laminates, for example, a so-called counter-pull layer opposite the wear layer and/or decorative layer is connected to the wood-based panel by pressing at the same time as the wear layer and/or decorative layer. The wear layer and/or decorative layer and the counterlayer can, if necessary, be formed at least predominantly from resin-impregnated papers, which can be printed but do not have to be. The resins can be melamine resins or phenolic resins. However, thicker carrier layers, for example in the form of wood-based panels, can also be dispensed with. For example, several layers of resin-impregnated papers can be pressed together, in which case a laminate known as a compact laminate can then be formed. In the following, laminate is understood to mean in particular the materials described. The term laminate can therefore be broadly understood in connection with the present invention.

The processes described above typically take place continuously. In the double belt press, two endless press belts run around, which are typically made of steel. A press gap is formed between the press belts, into which the wood material mat and/or the laminate is inserted. The press gap becomes narrower at least in the inlet area of the wood-based mat and/or the laminate, whereby the wood-based mat and/or the laminate is compacted to the desired size. Since the press belts are heated, for example by steam or thermal oil, the glue and/or the connecting agent distributed on the wood chips or wood fibers reacts between the layers of the laminate and a solid wood-based panel and/or a laminate is created that leaves the double belt press inseparably connected layers.

In addition to the press belts, known double belt presses also have press plates, with rolling rods or rollers connected at their ends between the press plates and the press belts, which reduce the friction between the moving press belts and the static press plates and still reduce heat transfer from the press plates to the press belts to ensure. Oil cushions are also used as an alternative to rolling rods and rollers. Several press cylinders and heating systems are provided along the press gap in order to be able to vary the temperature and pressure as well as the width of the press gap in the longitudinal direction of the press gap. The pressing temperature is between 150 °C and 250 °C and the thickness of the wood-based panels is typically between 1.5 mm and 60 mm. The wood-based panels are usually several meters wide and are cut into individual panels after leaving the double belt press. A double belt press according to the preamble of claim 1 is, for example, from WO 2004/076142 A2 known.

When pressing the wood-based panel and at elevated temperatures, residues of the glue and/or the wood-based materials as well as components emerging from the wood-based materials, in particular outgassing components, can stick to the press belts when the press belts are separated from the pressed wood-based panel. These adhesions are moved with the press belts into the inlet area of the press gap and through it, so that the adhesions come into contact with the supplied wood material mat. The adhesions can create depressions in the corresponding area side of the wood-based panel or come loose from the press sheet and affect the surfaces of the wood-based panel. In addition, it is easier for further pressing residues to stick to the adhering press residues than to the clean areas of the press belts, so that press residues can accumulate in some places on the press belt. This can result in the top layer of the wood-based panel being peeled off in patches during pressing. In addition, the pressing residue limits the heat transfer to the wood-based panel.

When pressing a laminate, i.e. the layers of the laminate into a coherent laminate, outgassing from the wood-based panel, components of the outer laminate layers, for example in the form of resin, such as melamine resin or phenolic resin, or other materials can also stick to the press belts.

In order to avoid these disadvantages, suitable wood materials and suitable glues are used, using as little glue as possible but as much glue as necessary. Furthermore, suitable temperatures and very smooth press belts are used, which reduce the tendency of residues to stick. These methods generally achieve quite good results. However, it cannot be guaranteed that certain surface requirements will be met over the long term and that no low-quality wood-based panels and/or laminates will be rejected.

Therefore, the present invention is based on the object of designing and developing the double belt press and the method of the type mentioned at the beginning and previously described in more detail in such a way that wood-based panels and / or laminates can be produced more reliably and with a higher surface quality.

This task is solved by a double belt press according to claim 1.

The stated task is further solved according to claim 6.

The invention has recognized that the reliability in the production of wood-based panels and laminates as well as their quality can be improved by at least partially removing deposits from the outside of at least one press belt by a polishing device, at a point after the outside of the press belt has been separated from the wood-based panel or the laminate but has not yet been brought into contact with the wood-based mat or the laminate again. In this way it can be achieved that a clean piece of the press belt is always used for pressing the wood material mat or the laminate and/or that the press residues cannot accumulate unhindered on the press belt but are at least partially removed again. The removal of the press residues can take place continuously and/or intermittently, depending on the actual contamination of the press belts. In addition, it may be sufficient to at least partially remove the pressing residues to ensure the desired quality of the wood-based panels. However, if there are high quality requirements, it is also provided that the at least one press belt is polished with the help of the polishing device. In this way, very clean and very smooth surfaces of the press belts are achieved, which leads to very clean, flat surfaces of the wood-based panel and/or the laminate.

For the sake of better understanding and to avoid unnecessary repetition, the double belt press and the process are described together below, without distinguishing in detail between the double belt press and the process. However, it is clear to the person skilled in the art based on the context which feature is preferred in relation to the double belt press and the method.

In a first particularly preferred embodiment of the double belt press, the at least one press belt is designed as a steel belt, in particular made of stainless steel. With such press belts, the tendency for press residues to adhere to these press belts is low. Steel press belts also do not wear out as quickly if the deposits in the form of press residues are removed mechanically using the at least one polishing device. Stainless steel is not affected by the pressing residues and retains a smooth surface for a long time. In addition, corresponding press belts are sufficient heat conductors and enable even temperature distribution during pressing. The double belt press is designed for continuously pressing and heating a wood-based mat to form a wood-based panel or a laminate. Wood-based peat panels, such as chipboard and fiberboard, can then be easily and reliably manufactured from glued wood material particles, such as chips and/or fibers from wood, and/or laminates, such as floor laminates or compact laminates, using the double belt press.

It has proven to be particularly effective and at the same time gentle on the at least one press belt that the at least one polishing device has at least one rotating polishing agent. If necessary, several rotating polishing means can also be provided, in particular next to one another. The cleaning effect of the polishing agents can be particularly high if the peripheral speed of the polishing agent and the press belt are aligned in opposite directions. The polishing agent then rotates in the opposite direction to the direction of movement of the associated press belt.

The at least one polishing device is provided so as to be displaceable transversely to the press belt. The polishing device can then be made correspondingly compact and still clean the press belt across its entire width, even if not simultaneously, but successively. Since the contamination of the press belts with pressing residues occurs gradually, it is sufficient if only a small area or narrow strip of the press belt is cleaned by the polishing device. Over time, the polishing device is moved, for example step by step or continuously, over the entire width of the press belt, or at least over the entire width of the press belt to be processed. The individual sections of the press belt are then cleaned at appropriate intervals, i.e. at least partially freed from adhesions.

In order to achieve reliable operation with little structural effort, at least one motor drive for moving the polishing device transversely to the press belt and at least one motor drive for driving a polishing agent are provided. It is particularly expedient that the at least one motor drive for driving a polishing agent with the polishing device can be moved transversely to the press belt. This means that the polishing agent can be driven independently of the position of the polishing device. In addition, the at least one motor drive for moving the polishing device is provided in a stationary manner. The design effort that would be required to move the corresponding motor drive together with the polishing device transversely to the press belt can then be saved.

In order to move the polishing device and a motor drive transversely to a press belt in a simple and reliable manner, a guide rail is provided which extends transversely to the corresponding press belt and guides the polishing device and/or a motor drive transversely to the steel belt during displacement. In this way, the polishing device and/or the motor drive can be moved back and forth in a reproducible manner. With regard to the drive of the polishing device along the guide rail, at least one motor drive interacts with the guide rail.

In order to ensure good cleaning that is gentle on the press belt, it may be advisable if the speed of displacement of the polishing device, the rotation speed of the polishing agent and/or the contact pressure of a polishing agent against the press belt can be adjusted. The corresponding parameters can be varied manually if necessary or can be specified via a controller, which then uses actuators to ensure the correct and automatic setting of the corresponding parameters.

The abrasion that occurs when cleaning the at least one press belt should not affect the double belt press or the pressing of the wood-based material mat and/or the laminate. Therefore, a polishing agent of the polishing device is assigned to a suction hood and is at least partially arranged in the suction hood. An air stream can then be sucked out of the suction hood, preferably continuously, which entrains the abrasion resulting from the removal of the pressing residues. The debris can then be collected at a suitable location and disposed of if necessary. To extract air from the extraction hood, a suction nozzle is attached to the extraction hood. The air flow for suction can preferably be generated with a commercially available fan.

Since the deposits that accumulate on the press belts over time have a detrimental effect, regardless of whether the press residues adhere to the lower press belt or to the upper press belt of the double belt press, at least one polishing device that polishes the outside of the respective steel belt can be assigned to each press belt outside the press gap. However, this can be dispensed with for reasons of cost if, for example, high quality requirements are only imposed with regard to one surface of the wood-based panel and/or the laminate.

In the process, the wood-based mat is continuously pressed and heated to form the wood-based panel and/or the laminate. Then, easily and reliably, wood-based panels, such as chipboard and fiberboard, can be made from glued wood-based material particles, such as chips and/or fibers made of wood, or laminates, in particular floor laminates, comprising a wear and decorative layer, a wood-based panel as a carrier layer and one of the wear and decorative layers Opposite opposing layer or compact laminates made of resin-soaked papers, which are manufactured with the double belt press.

For the sake of simplicity and to protect the press belt, the outside of the at least one press belt is used to remove the press residues and for polishing with a rotating polished. The at least partial removal of press residues can leave behind slight contamination on the press belt and/or the surface of the press belt is roughened after processing by the polishing device. In order to obtain a clean and smooth surface at least on the section of the press belt that has just been processed after treating the press belt with the at least one polishing device, it is advisable to polish the press belt. The press belt at least essentially retains the surface properties, such as smoothness and cleanliness, of a new press belt.

In order to gradually process or clean the entire press belt, at least the width of the press belt that comes into contact with the wood material mat or the laminate, with the polishing device, the at least one polishing device is used to process the at least one press belt in at least one direction transverse to the Press belt moved. Meanwhile, the polishing device processes the press belt continuously or step by step. The polishing device must then be brought back into the starting position if necessary in order to begin another cleaning cycle. How the polishing device returns to the starting position can be of secondary importance, as is the question of whether the polishing device continues to come into contact with the press belt. Cleaning the corresponding press belt is particularly easy and efficient because the polishing device is moved back and forth across the press belt. If necessary, the polishing device can remain in continuous contact with the press belt and process it. The direction in which the polishing device is displaced transversely to the press belt is preferably provided perpendicular to the transport direction of the press belt in the area of the polishing device. This leads to efficient cleaning of the press belt.

The polishing device is moved transversely to the press belt via at least one stationary motor drive. This is reliable and also structurally simple. In addition, the polishing device is moved along a guide rail that guides and holds the polishing device in order to achieve a defined and reproducible movement of the polishing device transversely to the corresponding press belt. For the sake of simplicity, a motor drive for moving the polishing machine will interact with the guide rail. In addition, the polishing agent is driven via at least one motor drive that can be displaced transversely to the press belt. This is structurally simple and also ensures a uniform drive of the polishing agent regardless of the displacement of the polishing device transversely to the associated press belt.

In order to avoid contamination of the double belt press, the wood material mat to be pressed and/or the laminate to be pressed, it is advisable to remove the abrasion resulting from cleaning the at least one press belt and dispose of it separately. For this purpose, the abrasion generated is at least partially sucked off via a suction hood. For the sake of simplicity, an air stream is also used for suction, which is sucked off via a suction nozzle connected to the suction hood.

In order to protect both press belts, in particular equally, from increasing contamination due to press residues, it is advisable to clean the press belts at least essentially equally. This can be done by at least partially removing the press residues adhering to the outer sides of both press belts outside the press gap by at least one polishing device. In order to achieve press belts that are as clean and flat as possible, the outer sides of the press belts can be polished by at least one polishing device.

• 1 eine erfindungsgemäße Doppelbandpresse beim Verpressen einer Holzwerkstoffmatte zu einer Holzwerkstoffplatte in einer schematischen vertikalen Schnittansicht längs zur Doppelbandpresse,
• 2 eine Poliereinrichtung der Doppelbandpresse aus 1 in einer perspektivischen Ansicht
• 3 die Poliereinrichtung aus 2 in einer Seitenansicht,
• 4 die Poliereinrichtung aus 2 in einer Ansicht von unten und
• 5 den Antrieb des Poliermittels der Poliereinrichtung aus 2 in einer perspektivischen Detailansicht.

The invention is explained in more detail below using a drawing that only shows an exemplary embodiment. Shown in the drawing

• 1 a double belt press according to the invention when pressing a wood-based mat into a wood-based panel in a schematic vertical sectional view along the double-belt press,
• 2 a polishing device for the double belt press 1 in a perspective view
• 3 the polishing device 2 in a side view,
• 4 the polishing device 2 in a view from below and
• 5 the drive of the polishing agent of the polishing device 2 in a perspective detailed view.

In the 1 a double belt press 1 for pressing and heating a wood-based mat 2 to form a wood-based panel 3 is shown. The double belt press could, in principle, also be designed to press a laminate. The double belt press 1 shown and preferred in this respect either presses a mat made of glued wood chips into a chipboard or an OSB board or a mat made of glued wood fibers into a fiberboard. The wood Material mat 2 is fed to the double belt press 1 with a comparatively large layer thickness on a conveyor belt 4. In the double belt press 1, the wood material mat 2 enters a press gap 5 between an upper press belt 6 and a lower press belt 7, both of which press the wood material mat 2 together with their outer sides and compress it up to the desired thickness of the wood material board 3 to be produced. The press belts 6, 7 are heated and transfer heat to the wood material 8 passing through the press gap 5 of the double belt press 1. The heat absorbed by the wood material 8 leads to rapid setting and/or hardening of the glue applied to the wood material particles, so that a compressed solid Wood material board 3 is formed, which leaves the press gap 5 on the back of the double belt press 1 and is taken over by a conveyor belt 9. The endless wood material panel 3 formed in this way is then cut into individual panels.

The press belts 6,7 of the illustrated and preferred double belt press 1 run endlessly around front circulation drums 10 and rear circulation drums 11. Adjacent to the press gap 5, interconnected rolling rods 14 are provided between the stationary press plates 12, 13 and the associated press belts 6, 7. These rolling rods 14 roll with the press belts 6,7 along the press plates 12,13 in the transport direction of the wood material mat 2 in order to reduce friction losses. The press plates 12, 13 are heated, for example, using thermal oil and pressed in the direction of the press gap 5 via pressure cylinders 15. The contact pressure and the temperature along the press gap 5 can be adjusted. For this purpose, the press plates 12, 13 can be divided into press plate segments, which can be heated to different degrees and pressed to different degrees against the wood material 8 in the press gap 5 via separate pressure cylinders 15. The wood material mat 2 is pressed, for example, at temperatures between 150 ° C and 250 ° C, in particular between 200 ° C and 250 ° C, to form wood material panels 3 with thicknesses, for example between 1.5 mm and 60 mm.

When pressing the wood material mat 2, substances and/or components may emerge from the wood material 8, in particular outgassing, which at least partially adhere to the press belts 6, 7. However, parts of the glue provided on the surface of the wood-based panel 3 can also remain stuck to the press belts 6, 7. In addition, it is possible that the wood materials 8 as such and/or integrated into the glue remain adhered to the outer sides of the press belts 6,7. The corresponding adhesions in the form of press residues 16, shown greatly enlarged for the sake of clarity, are moved back with the press belts 6, 7 towards the front end of the press gap 5. In this way, each press belt 6,7 of the illustrated and therefore preferred double belt press 1 is guided past a polishing device 17, which at least partially removes press residues 16 adhering to the press belts 6,7.

The ones in the 2 Polishing devices 17 shown in more detail and preferred in this respect are slowly moved from one edge of the associated press belt 6.7 to the opposite edge of the press belt 6.7 and back again. The polishing devices 17 then begin to move again transversely to the press belts 6,7. Meanwhile, the polishing devices 17 clean the areas of the press belts 6, 7 that are guided past the polishing devices 17. The polishing devices 17 are held on a guide rail 18 along which the polishing device 17 is moved back and forth. The displacement of the polishing device 17 is effected by a motor drive 19, which is connected in a stationary manner to one end of the guide rail 18. To reverse the direction of movement of the polishing device 17, if necessary, limit switches 30 or proximity switches can be provided on the guide rail 18, which detect when an end position of the polishing device 17 has been reached and forward a corresponding signal to a control device. The actual polishing device 17 is driven via a further motor drive 20, which is displaced along the guide rail 18 with the polishing device 17. A corresponding electrical connection 21 is provided to supply voltage to this further motor drive 20. The abrasion resulting from cleaning the press belt 6,7 is sucked off via a suction hood 22 and a suction nozzle 23.

In the 3 the polishing device 17 is shown in a side view. On the left is the polishing agent 24, which is predominantly arranged in the suction hood 22 and is in contact with the press belt 6,7. To remove press residues 16 adhering to the press belt 6,7, the polishing agent 24 is rotated about an axis of rotation at least approximately parallel to the press belt 6,7, specifically in a direction that is opposite to the transport direction of the press belt 6,7 in the area of the polishing device 17. A hose or a line can be connected to the suction nozzle 23, via which the extracted air is sucked out of the suction hood 22 together with the sucked-in abrasion. In the illustrated and preferred polishing device 17, the guide rail 18 is provided at least essentially parallel to the axis of rotation of the polishing agent 24 hen. A guide carriage 25 is held on the guide rail 18 and carries both the motor drive 20 for the polishing agent 24 as well as the polishing agent 24 and the suction hood 22 with the suction nozzle 23.

In the 4 the polishing device 17 is shown in a view from below. The polishing agent 24 shown and preferred in this respect is composed of three polishing disks 26 provided next to one another, which can be replaced individually or together in the event of wear. The suction hood 22 has an opening 27 that is large enough to enable reliable contact between the press belt 6,7 and the polishing agent 24. However, the opening 27 of the suction hood 22 is also small enough to generate such a strong air flow that it carries away the abrasion that occurs in the form of small particles when cleaning the press belt 6, 7 and can remove or suck it out via the suction nozzle 23.

In the 5 the drive of the polishing agent 24 of the polishing device 17 is shown in detail. The motor drive 20 is connected via a belt drive 28 to a shaft 29 on which the polishing disks 26 of the polishing agent 24 are arranged. The polishing agent 24 is at least essentially concentric and rotationally symmetrical to the shaft 29 carrying the polishing agent 24. Both the shaft 29 with the polishing agent 24 and the motor drive 20 are fixed to the guide carriage 25 of the polishing device 17, which is moved back and forth along the guide rail 18 and across the press belt 6,7. In the illustrated and preferred polishing device 17, this displacement of the polishing device 17 takes place slowly but continuously, so that all areas of the associated press belt 6, 7 are at least partially cleaned or polished by the polishing agent 24 at sufficient time intervals. Alternatively, the polishing device 17 could also be moved step by step along the guide rail 18. It could also be provided that the polishing agent 24 only comes into contact with the associated press belt 6,7 intermittently. If necessary, excessive abrasion of the press belt 6,7 itself can be avoided.

Reference symbol list

1

Double belt press

2

Wood material mat

3

Wood-based panel

4

conveyor belt

5

press gap

6

Press belt

7

Press belt

8th

Wood material

9

conveyor belt

10,11

Circulating drums

12,13

Pressed sheets

14

Rolling rods

15

pressure cylinder

16

Press residues

17

Polishing device

18

Guide rail

19, 20

motor drive

21

electrical connection

22

Suction hood

23

Suction nozzle

24

Polishing agent

25

Guide carriage

26

Polishing discs

27

opening

28

Belt drive

29

Wave

30

Limit switch

Claims (8)

Double belt press (1) for continuously pressing a wood-based material mat (2) to form a wood-based material board (3) or a laminate with two press belts (6, 7) which form a press gap (5) between each other and which circulate endlessly around at least two deflection means, the press belts (6, 7) each have an outside that comes into contact with the wood-based mat (2) or the laminate and an inside that does not come into contact with the wood-based mat (2) or the laminate, characterized in that the double belt press (1) for continuous pressing and heating Wood material mat (2) for forming the wood material board (3) or the laminate is designed so that at least one polishing device (17) which removes at least part of the pressing residues (16) from the outside of at least one press belt (6, 7) outside the press gap (5) it is provided that the polishing device (17) is provided for polishing the outside of the press belt (6, 7), that the at least one polishing device (17) has rotating polishing means (24), that at least one motor drive (20) for driving a polishing means ( 24) of the polishing device (17) can be moved transversely to the press belt (6,7) so that the at least one polishing unit Direction (17) is displaceable transversely to the press belt (6,7), that at least one motor drive (19) for moving the polishing device (17) transversely to the press belt (6,7) is provided in a stationary manner, that transversely to a press belt (6 ,7) a guide rail (18) for moving a polishing device (17) transversely to the press belt (6,7) is provided, that the at least one motor drive (19) for moving the polishing device (17) transversely to the press belt (6,7) interacts with the guide rail (18), that the one polishing agent (24) of the polishing device is at least partially arranged in a suction hood (22) which is displaceable together with the polishing agent transversely to the press belt (6, 7), and that the suction hood (22) is provided with a Suction nozzle (23) is provided for sucking the abrasion out of the suction hood (22). Double belt press Claim 1 , characterized in that the at least one press belt (6,7) is designed as a steel belt. Double belt press Claim 2 , characterized in that the at least one press belt (6,7) is made of stainless steel. Double belt press according to one of the Claims 1 until 3 , characterized in that the speed of displacement of the polishing device (17), the rotation speed of the polishing agent (24) and / or the contact pressure of a polishing agent (24) against the press belt (6,7) can be adjusted. Double belt press according to one of the Claims 1 until 4 , characterized in that at least one polishing device (17) which polishes the outside of the respective press belt (6,7) is assigned to each press belt (6,7) outside the press gap (5). Method for continuously pressing and heating a wood-based mat (2) to form a wood-based panel (3) or a laminate, using a double belt press (1), - in which the wood material mat (2) or the laminate is fed into a press gap (5) formed between two press belts (6, 7) rotating endlessly around at least two deflection means, - in which the wood material mats (2) or the laminate come into contact with the outer sides of the press belts (6, 7) and are pressed, - in which at least one polishing device (17) outside the press gap (5) at least partially removes the press residues (16) adhering to the outside of at least one press belt (6, 7), - in which the outside of the at least one press belt (6,7) is processed with a rotating polishing agent (24) for removing the press residues (16) and/or for polishing, in which the at least one polishing device (17) polishes the outside of the press belt (6,7) outside the press gap (5), in which the wood-based mat (2) is continuously pressed and heated to form the wood-based panel (3) or the laminate, in which the at least one polishing device (17) for processing the at least one press belt (6,7) is displaced in at least one direction transversely to the press belt (6,7), - in which the at least one polishing device (17) for processing the at least one press belt (6,7) is moved back and forth transversely to the press belt (6,7) in at least one direction, - in which the polishing device (17) is moved transversely to the press belt (6,7) via at least one motor drive (19), - in which the polishing device (17) is moved along a guide rail (18) guiding the polishing device (17), - in which the polishing agent (24) is driven via at least one motor drive (20), - in which the at least one motor drive (19) for moving the polishing device (17) is stationary transversely to the press belt (6,7), - in which the guide rail (18) holds the polishing device (17) and in which the guide rail (18) interacts with the motor drive (19) and in which the motor drive (20) driving the polishing agent (24) transversely to the press belt (6 ,7) is movable, in which the abrasion generated by the polishing device (17) is at least partially sucked off via a suction hood (22), in which the abrasion generated by the polishing device (17) is at least partially sucked off via the suction hood (22) and a suction nozzle (23) assigned to the suction hood (22), in which the suction hood (22) together with the polishing agent (24) transversely to the press belt (6,7) is moved and one polishing means (24) of the polishing device (17) is at least partially arranged in the suction hood (22). Procedure according to Claim 6 in which the press residues (16) adhering to the outer sides of both press belts (6, 7) are at least partially removed outside the press gap (5) by at least one polishing device (17). Procedure according to Claim 7 , in which the outer sides of the press belts (6,7) are polished by at least one polishing device (17).

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